Occasionally, you will receive an offer of additional bonus points for adding authorized users to your account. (upgradedpoints.com)
During that same three month period, a bonus gift of 5000 miles is awarded for adding an additional authorized user to an account. (lendedu.com)
Additional 5,000 points will be transferred to your account as soon as you add a first authorized user to your account and make a first purchase. (effectify.com)